Problems With a Zoeller M267

According to Zoeller, the M267 submersible sewage pump is a rugged and dependable unit.

Float Switch

It has a cast iron body and uses stainless steel bolts for longevity. The pump is submersible and is dust-proof. Problems do arise with it, however. These are not hard to diagnose, and by performing regular maintenance and check-ups, the pump can last for years.

The Zoeller pump organization states that a stuck float switch is one of the main causes of pump failure. What happens is the switch may be stuck in the low-level position, which allows the pump to keep running when dry. Since it is a submersible pump, it relies on the fluid for cooling and lubrication of the impeller and pump mechanisms. Running the pump when dry will eventually burn out the bearings.

Intake Clogging

If the intake is allowed to clog, no lubricating fluid enters the pump section. The motor still spins, and the pump bearings will eventually burn out due to dry running. To prevent this, check the intake from time to time to clear any clogging that may occur. Special filters may be obtained or designed, which will allow fluid in, but keep clogging material out.

Lack of Maintenance

The pump does need regular maintenance. Every year, clean and check the impeller and pump internals. Clean the impeller assembly thoroughly to remove debris such as small rocks or sticks. Zoeller pump organization recommends checking the outlet pipe often for clogging issues, since a clog creates undue back pressure. This can strain the motor, reducing its lifespan.

About the Author

Tony Oldhand has been technical writing since 1995. He has worked in the skilled trades and diversified into Human Services in 1998, working with the developmentally disabled. He is also heavily involved in auto restoration and in the do-it-yourself sector of craftsman trades. Oldhand has an associate degree in electronics and has studied management at the State University of New York.